Celebrate the occasion with a batch of gourmet cookies. Weighing in at almost 6 ounces each, these birthday cake stuffed cookies will give you another reason to celebrate.
Prep oven. Preheat the oven to 375°F and line a baking sheet with parchment paper.
Mix dry ingredients. Whisk together the flour, cornstarch, baking powder, and salt in a large bowl.
Cream butter and sugar. In a separate bowl, beat the butter and sugar for 2 to 4 minutes until light and fluffy.
Add wet ingredients. Mix in the eggs, vanilla extract, and almond extract until fully combined.
Combine dough. Add half of the dry ingredients and mix on low speed until incorporated, then add the remaining dry ingredients and mix again until a thick dough forms.
Adjust texture. Dough should be soft and pliable like playdough. If too dry, add a splash of milk. If too sticky, add flour 1 tablespoon at a time.
Fold in sprinkles. Mix in the rainbow jimmies until evenly distributed.
Assemble cookies. Divide dough into 9 balls, about 4.5 ounces each. Slice each dough ball and each snack cake in half. Flatten one dough half, place half a cake on top, cover with the remaining dough, seal edges, and gently roll into a ball.
Bake. Space cookies evenly on the baking sheet and bake for 9 to 10 minutes. Cookies should look set but not glossy.
Cool. Let cookies cool completely on the baking sheet, about 1 hour, to finish setting.
Decorate. Melt white chocolate in 30 second intervals until smooth. Spoon a small amount onto each cookie, gently spread, and top with confetti sprinkles and cake pieces if desired.
Set and serve. Allow chocolate to set for about 15 minutes before serving.
Notes
Variations. Swap Birthday Cakes for other snack cakes like Cake Bites.
Recipe Tips. Use jimmies in the dough for best color. Cookies finish setting as they cool and may seem underbaked at first. An internal temp of 160°F or higher indicates doneness.
Make Ahead. Dough can be refrigerated for up to 2 days or frozen for up to 3 months. Bake from frozen with a slight time increase.
Storage. Store cookies in an airtight container in a single layer or with parchment between layers for up to 1 week.